﻿CONTENTS. 
  

  

  Introduction 
  81 
  

  

  Conditions 
  of 
  the 
  experiments 
  81 
  

  

  Results 
  83 
  

  

  Miscellaneous 
  tests 
  89 
  

  

  Conclusions 
  90 
  

  

  ILLUSTRATIONS 
  

  

  PLATES. 
  

  

  Page. 
  

   Pi 
  ate 
  XI. 
  Fig. 
  1. 
  — 
  Sprayed 
  twig 
  of 
  wild 
  cherry 
  showing 
  larvae 
  of 
  the 
  fall 
  

   webworm 
  (Hyphantria 
  runea) 
  feeding 
  on 
  leaves; 
  at 
  right, 
  same, 
  covered 
  with 
  

   paper 
  bag, 
  to 
  prevent 
  escape 
  of 
  larvae. 
  Fig. 
  2. 
  — 
  Unsprayed 
  twig 
  of 
  wild 
  

   cherry 
  upon 
  which 
  fall 
  web 
  worms 
  have 
  been 
  feeding 
  for 
  some 
  time; 
  for 
  

   comparison 
  with 
  sprayed 
  twig 
  84 
  

  

  